One of the best book quotes about painful stiffness
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“But in the fifth year of his life, the little prince began to show signs of disturbing illness. There was a painful stiffness in his joints, he had a constant feeling of chill, and his face, which was normally so lively and expressive, was becoming masklike and rigid. Princess mariposa was worried to distraction, for he no longer looked nearly so handsome next to her.”